Patient-ventilator dyssynchrony detection
First Claim
1. A method of detecting dyssynchrony between a patient and a pressure support system, comprising:
- receiving patient flow data representing a patient flow waveform, the patient flow waveform representing a flow of gas provided to the patient by the pressure support system;
obtaining an I/E state signal indicating whether a current respiratory phase of the patient is inspiratory or expiratory, the I/E state signal being in binary form and having only a first binary state and a second binary state, the first binary state indicating that the current respiratory phase is inspiratory and the second binary state indicating that the current respiratory phase is expiratory; and
analyzing both the patient flow data and the I/E state signal for a breath to determine whether at least one of a number of predetermined criterion is satisfied based on both the patient flow data and the I/E state signal and declaring a dyssynchrony for the breath and outputting a dyssynchrony indicator if it is determined that at least one of the number of predetermined criterion is satisfied based on both the patient flow data and the I/E state signal, wherein the dyssynchrony is a condition where a respiratory drive of the patient is out of sync with breaths being generated by the pressure support system, wherein the number of predetermined criterion includes all of;
(i) a number of volume qualified flow slope reversals in the patient flow data for the breath exceeding a predetermined number;
(ii) an incremented tidal volume during at least a portion of an expiratory phase of the breath as indicated by the I/E state signal exceeding a predetermined positive value;
(iii) an absolute value of a tidal volume during the breath exceeds a predetermined value; and
(iv) a tidal volume during an inspiratory phase of the breath as indicated by the I/E state is less than a predetermined negative value.
1 Assignment
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Accused Products
Abstract
A method of detecting dyssynchrony between a patient and a pressure support system includes receiving patient flow data relating to a flow of gas provided to the patient by the pressure support system, receiving an I/E state signal representing a respiratory phase of the patient as determined by the pressure support system, and analyzing the patient flow data and the I/E state signal and declaring a dyssynchrony for a breath based on at least one of the patient flow data and the I/E state signal. The method includes determining whether at least one of a number of predetermined criterion is satisfied based on at least one of the patient flow data and the I/E state signal, and declaring the dyssynchrony for the breath if it is determined that at least one of the number of predetermined criterion is satisfied.
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Citations
39 Claims
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1. A method of detecting dyssynchrony between a patient and a pressure support system, comprising:
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receiving patient flow data representing a patient flow waveform, the patient flow waveform representing a flow of gas provided to the patient by the pressure support system; obtaining an I/E state signal indicating whether a current respiratory phase of the patient is inspiratory or expiratory, the I/E state signal being in binary form and having only a first binary state and a second binary state, the first binary state indicating that the current respiratory phase is inspiratory and the second binary state indicating that the current respiratory phase is expiratory; and analyzing both the patient flow data and the I/E state signal for a breath to determine whether at least one of a number of predetermined criterion is satisfied based on both the patient flow data and the I/E state signal and declaring a dyssynchrony for the breath and outputting a dyssynchrony indicator if it is determined that at least one of the number of predetermined criterion is satisfied based on both the patient flow data and the I/E state signal, wherein the dyssynchrony is a condition where a respiratory drive of the patient is out of sync with breaths being generated by the pressure support system, wherein the number of predetermined criterion includes all of;
(i) a number of volume qualified flow slope reversals in the patient flow data for the breath exceeding a predetermined number;
(ii) an incremented tidal volume during at least a portion of an expiratory phase of the breath as indicated by the I/E state signal exceeding a predetermined positive value;
(iii) an absolute value of a tidal volume during the breath exceeds a predetermined value; and
(iv) a tidal volume during an inspiratory phase of the breath as indicated by the I/E state is less than a predetermined negative value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A method of detecting dyssynchrony between a patient and a pressure support system, comprising:
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receiving patient flow data representing a patient flow waveform, the patient flow waveform representing a flow of gas provided to the patient by the pressure support system; obtaining an I/E state signal indicating whether a current respiratory phase of the patient is inspiratory or expiratory, the I/E state signal being in binary form and having only a first binary state and a second binary state, the first binary state indicating that the current respiratory phase is inspiratory and the second binary state indicating that the current respiratory phase is expiratory; and analyzing both the patient flow data and the I/E state signal for a breath to determine whether at least one of a number of predetermined criterion is satisfied based on both the patient flow data and the I/E state signal and declaring a dyssynchrony for the breath and outputting a dyssynchrony indicator if it is determined that at least one of the number of predetermined criterion is satisfied based on both the patient flow data and the I/E state signal, wherein the dyssynchrony is a condition where a respiratory drive of the patient is out of sync with breaths being generated by the pressure support system, further comprising determining an incremental tidal volume from the patient flow data for at least a portion of an expiratory phase of the breath as indicated by the I/E state signal, wherein the at least one of a number of predetermined criterion is based on the incremental tidal volume, and wherein the declaring a dyssynchrony comprises declaring the dyssynchrony for the breath if it is determined that the incremental tidal volume exceeds a predetermined positive value.
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17. A method of detecting dyssynchrony between a patient and a pressure support system, comprising:
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receiving patient flow data representing a patient flow waveform, the patient flow waveform representing a flow of gas provided to the patient by the pressure support system; obtaining an I/E state signal indicating whether a current respiratory phase of the patient is inspiratory or expiratory, the I/E state signal being in binary form and having only a first binary state and a second binary state, the first binary state indicating that the current respiratory phase is inspiratory and the second binary state indicating that the current respiratory phase is expiratory; and analyzing both the patient flow data and the I/E state signal for a breath to determine whether at least one of a number of predetermined criterion is satisfied based on both the patient flow data and the I/E state signal and declaring a dyssynchorny for the breath and outputting a dyssynchorny indicator if it is determined that at least one of the number of predetermined criterion is satisfied based on both the patient flow data and the I/E state signal, wherein the dyssynchorny is a condition where a respiratory drive of the patient is out of sync with breaths being generated by the pressure support system, further comprising determining a tidal volume from the patient flow data for an inspiratory phase of the breath as indicated by the I/E state, wherein the at least one of a number of predetermined criterion is based on the tidal volume, and wherein the declaring a dyssynchrony comprises declaring the dyssynchrony for the breath if it is determined that the tidal volume is less than a predetermined negative value.
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18. A pressure support system, comprising:
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a pressure generating system adapted to produce a flow of gas; a patient circuit operatively coupled to the pressure generating system to deliver the flow of gas to an airway of a patient; and a controller operatively coupled to the pressure generating system, the controller being adapted to detect dyssynchrony between the patient and the pressure support system by; receiving patient flow data representing a patient flow waveform, the patient flow waveform representing the flow of gas provided to the patient by the pressure support system; receiving an I/E state signal indicating whether a current respiratory phase of the patient is inspiratory or expiratory as determined by the pressure support system, the I/E state signal being in binary form and having only a first binary state and a second binary state, the first binary state indicating that the current respiratory phase is inspiratory and the second binary state indicating that the current respiratory phase is expiratory; and analyzing both the patient flow data and the I/E state signal for a breath to determine whether at least one of a number of predetermined criterion is satisfied based on both the patient flow data and the I/E state signal and declaring a dyssynchrony for the breath and outputting a dyssynchrony indicator if it is determined that at least one of the number of predetermined criterion is satisfied based on both the patient flow data and the I/E state signal, wherein the dyssynchrony is a condition where a respiratory drive of the patient is out of sync with breaths being generated by the pressure support system, wherein the number of predetermined criterion includes all of;
(i) a number of volume qualified flow slope reversals in the patient flow data for the breath exceeding a predetermined number;
(ii) an incremental tidal volume during at least a portion of an expiratory phase of the breath as indicated by the I/E state signal exceeding a predetermined positive value;
(iii) an absolute value of a tidal volume during the breath exceeds a predetermined value; and
(iv) a tidal volume during an inspiratory phase of the breath as indicated by the I/E state is less than a predetermined negative value. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25)
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26. A pressure support system, comprising:
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a pressure generating system adapted to produce a flow of gas; a patient circuit operatively coupled to the pressure generating system to deliver the flow of gas to an airway of a patient; and a controller operatively coupled to the pressure generating system, the controller being adapted to detect dyssynchorny between the patient and the pressure support system by; receiving patient flow data representing a patient flow waveform, the patient flow waveform representing the flow of gas provided to the patient by the pressure support system; receiving an I/e state signal indicating whether a current respiratory phase of the patient is inspiratory or expiratory as determined by the pressure support system, the I/E state signal being in binary form and having only a first binary state and a second binary state, the first binary state indicating that the current respiratory phase is inspiratory and the second binary state indicating that the current respiratory phase is expiratory; and analyzing both the patient flow data and the I/E state signal for a breath to determine whether at least one of a number of predetermined criterion is satisfied based on both the patient flow data and the I/E state signal and declaring a dyssynchorny for the breath and outputting a dyssynchorny indicator if it is determined that at least one of the number of predetermined criterion is satisfied based on both the patient flow data and the I/E state signal, wherein the dyssynchorny is a condition where a respiratory drive of the patient is out of sync with breaths being generated by the pressure support system, wherein the controller is adapted to determine an incremental tidal volume from the patient flow data for at least a portion of an expiratory phase of the breath as indicated by the I/E state signal, wherein the at least one of a number of predetermined criterion is based on the incremental tidal volume, and wherein the declaring a dyssynchrony comprises declaring the dyssynchrony for the breath if it is determined that the incremental tidal volume exceeds a predetermined positive value.
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27. A pressure support system, comprising:
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a pressure generating system adapted to produce a flow of gas; a patient circuit operatively coupled to the pressure generating system to deliver the flow of gas to an airway of a patient; and a controller operatively coupled to the pressure generating system, the controller being adapted to detect dyssynchorny between the patient and the pressure support system by; receiving patient flow data representing a patient flow waveform, the patient flow waveform representing the flow of gas provided to the patient by the pressure support system; receiving an I/E state signal indicating whether a current respiratory phase of the patient is inspiratory or expiratory as determined by the pressure support system, the I/E state signal being in binary form and having only a first binary state and a second binary state, the first binary state indicating that the current respiratory phase is inspiratory and the second binary state indicating that the current respiratory phase is expiratory, and analyzing both the patient flow data and the I/E state signal for a breath to determine whether at least one of a number of predetermined criterion is satisfied based on both the patient flow data and the I/E state signal and declaring a dyssynchorny for the breath and outputting a dyssynchorny indicator if it is determined that at least one of the number of predetermined criterion is satisfied based on both the patient flow data and the I/E state signal, wherein the dyssynchorny is a condition where a respiratory drive of the patient is out of sync with breaths being generated by the pressure support system, wherein the controller is adapted to determine a tidal volume from the patient flow data for an inspiratory phase of the breath as indicated by the I/E state, wherein the at least one of a number of predetermined criterion is based on the tidal volume, and wherein the declaring a dyssynchrony comprises declaring the dyssynchrony for the breath if it is determined that the tidal volume is less than a predetermined negative value.
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28. An apparatus for detecting dyssynchrony between a patient and a pressure support system, comprising:
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a housing separate from the pressure support system; and a controller provided within the housing and operatively coupled to the pressure support system, the controller being adapted to detect dyssynchrony between the patient and the pressure support system by; receiving patient flow data representing a patient flow waveform, the patient flow waveform representing a flow of gas provided to the patient by the pressure support system; obtaining an I/E state signal indicating whether a current respiratory phase of the patient is inspiratory or expiratory, the I/E state signal being in binary form and having only a first binary state and a second binary state, the first binary state indicating that the current respiratory phase is inspiratory and the second binary state indicating that the current respiratory phase is expiratory; and analyzing both the patient flow data and the I/E state signal for a breath to determine whether at least one of a number of predetermined criterion is satisfied based on both the patient flow data and the I/E state signal and declaring a dyssynchrony for the breath and outputting a dyssynchrony indicator if it is determined that at least one of the number of predetermined criterion is satisfied based on both the patient flow data and the I/E state signal, wherein the dyssynchrony is a condition where a respiratory drive of the patient is out of sync with breaths being generated by the pressure support system, wherein the number of predetermined criterion includes all of;
(i) a number of volume qualified flow slope reversals in the patient flow data for the breath exceeding a predetermined number;
(ii) an incremental tidal volume during at least a portion of an expiratory phase of the breath as indicated by the I/E state signal exceeding a predetermined positive value;
(iii) an absolute value of a tidal volume during the breath exceeds a predetermined value; and
(iv) a tidal volume during an inspiratory phase of the breath as indicated by the I/E state is less than a predetermined negative value. - View Dependent Claims (29, 30, 31, 32, 33, 34, 35, 36, 37)
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38. An apparatus for detecting dyssynchorny between a patient and a pressure support system, comprising:
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a housing separate from the pressure support system; and a controller provided within the housing and operatively coupled to the pressure support system, the controller being adapted to detect dyssynchorny between the patient and the pressure support system by; receiving patient flow data representing a patient flow waveform, the patient flow waveform representing a flow of gas provided to the patient by the pressure support system, obtaining an I/E state signal indicating whether a current respiratory phase of the patient is inspiratory or expiratory, the I/E state signal being in binary form and having only a first binary state and a second binary state, the first binary state indicating that the current respiratory phase is inspiratory and the second binary state indicating that the current respiratory phase is expiratory; and analyzing both the patient flow data and the I/E state signal for a breath to determine whether at least one of a number of predetermined criterion is satisfied based on both the patient flow data and the I/E state signal and declaring a dyssynchorny for the breath and outputting a dyssynchorny indicator if it is determined that at least one of the number of predetermined criterion is satisfied based on both the patient flow data and the I/E state signal, wherein the dyssynchorny is a condition where a respiratory drive of the patient is out of sync with breaths being generated by the pressure support system, wherein the controller is adapted to determine an incremental tidal volume from the patient flow data for at least a portion of an expiratory phase of the breath as indicated by the I/E state signal, wherein the at least one of a number of predetermined criterion is based on the incremental tidal volume, and wherein the declaring a dyssynchrony comprises declaring the dyssynchrony for the breath if it is determined that the incremental tidal volume exceeds a predetermined positive value.
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39. An apparatus for detecting dyssynchorny between a patient and a pressure support system, comprising:
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a housing separate from the pressure support system; and a controller provided within the housing and operatively coupled to the pressure support system, the controller being adapted to detect dyssynchorny between the patient and the pressure support system by; receiving patient flow data representing a patient flow waveform, the patient flow waveform representing a flow of gas provided to the patient by the pressure support system; obtaining an I/E state signal indicating whether a current respiratory phase of the patient is inspiratory or expiratory, the I/E state signal being in binary form and having only a first binary state and a second binary state, the first binary state indicating that the current respiratory phase is inspiratory and the second binary state indicating that the current respiratory phase is expiratory; and analyzing both the patient flow data and the I/E state signal for a breath to determine whether at least one of a number of predetermined criterion is satisfied based on both the patient flow data and the I/E state signal and declaring a dyssynchorny for the breath and outputting a dyssynchorny indicator if it is determined that at least one of the number of predetermined criterion is satisfied based on both the patient flow data and the I/E state signal, wherein the dyssynchorny is a condition where a respiratory drive of the patient is out of sync with breaths being generated by the pressure support system, wherein the controller is adapted to determine a tidal volume from the patient flow data for an inspiratory phase of the breath as indicated by the I/E state, wherein the at least one of a number of predetermined criterion is based on the tidal volume, and wherein the declaring a dyssynchrony comprises declaring the dyssynchrony for the breath if it is determined that the tidal volume is less than a predetermined negative value.
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Specification